package cloud.lysky.java.on.datastruct_and_algorithm.day00001;

// 请实现一个函数，把字符串 s 中的每个空格替换成"%20"
//示例 1：
//输入：s = "We are happy."
//输出："We%20are%20happy."
//限制：0 <= s 的长度 <= 10000
class Solution {
    public String replaceSpace(String s) {
        if(s == null){
            return "";
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            if (s.charAt(i) == ' ') {
                sb.append("%20");
            } else {
                sb.append(s.charAt(i));
            }
        }
        return sb.toString();
    }
}
